(Mark One) ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period ended March31, 2026 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from to .Commission File Number 001-33155 IPG PHOTONICS CORPORATION (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction ofincorporation or organization) Registrant’s telephone number, including area code:(508)373-1100 Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant: (1)has filed all reports required to be filed by Section13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required to file such reports), and(2)has been subject to such filing requirements for the past 90days.Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data file required to be submittedpursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that theregistrant was required to submit such files).Yes☑No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reportingcompany, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company,"and"emerginggrowthcompany"inRule12b-2oftheExchangeAct. Large Accelerated FilerNon-Accelerated FilerEmerging Growth Company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Exchange Act).Yes☐No☑As of May4, 2026, there were 42,443,616 shares of the registrant's common stock outstanding. TABLE OF CONTENTS Part I. Financial InformationItem1. Unaudited Interim Financial StatementsCondensed Consolidated Balance Sheets: March 31, 2026and December31, 2025Condensed Consolidated Statements of Operations: Three MonthsEnded March 31, 2026 and 2025Condensed Consolidated Statements of Comprehensive(Loss) Income: Three Months Ended March31, 2026 and 2025Condensed Consolidated Statements of Cash Flows:Three Months Ended March 31, 2026 and 2025Condensed Consolidated Statements of Equity: Three Months Ended March 31, 2026 and 2025Notes to Condensed Consolidated Financial StatementsItem2. Management's Discussion and Analysis of Financial Condition and Results of OperationsItem3. Quantitative and Qualitative Disclosures About Market RiskItem4. Controls and ProceduresPart II. Other InformationItem1. Legal ProceedingsItem1A. Risk FactorsItem2. Unregistered Sales of Equity Securities and Use of ProceedsItem3. Defaults Upon Senior SecuritiesItem4. Mine Safety DisclosuresItem5. Other InformationItem6. ExhibitsSignatures ITEM1. UNAUDITED INTERIM FINANCIAL STATEMENTS IPG PHOTONICS CORPORATIONCONDENSED CONSOLIDATED BALANCE SHEETS(UNAUDITED) IPG PHOTONICS CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS(UNAUDITED) IPG PHOTONICS CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME(UNAUDITED) IPG PHOTONICS CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(UNAUDITED) IPG PHOTONICS CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF EQUITY(UNAUDITED) IPG PHOTONICS CORPORATIONNOTESTO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except share and per share data) 1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation— The accompanying unaudited Condensed Consolidated Financial Statements have been prepared by IPGPhotonics Corporation, or "IPG", "its" or the "Company". Certain information and footnote disclosures normally included in financialstatements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed oromitted pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The Condensed Consolidated FinancialStatements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation.These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and notesthereto in the Company's Annual Report on Form 10-K for the year ended December31, 2025. Beginning in the current period, the Company revised the categories used to disaggregate revenue by application and by product tobetter reflect how management evaluates the business. Certain prior-period amounts have been reclassified to conform to the current-periodpresentation. These changes had no impa